Cornelis Drebbels. Not only did he invent the thermometer he also invented the thermostat—an early example of cybernetics. Basically, expanding mercury would pu

Cornelis Drebbels. Not only did he invent the thermometer he also invented the thermostat—an early example of cybernetics. Basically, expanding mercury would push up a plunger than would open the door to an egg incubator. By allowing the cold air in, the temperature of the incubator would decrease until the mercury shrank and the vent closed